ISO/CIE 19476:2014适用于照度和亮度计。它定义了在一般照明测量情况下表征此类设备性能的质量指数，以及单个指数和标准校准条件的测量程序。 照度或亮度的测量及其精度受各种参数的影响，如操作条件、光源特性以及所用光度计的特性。这些光度计的特性本身不允许确定特定测量任务的测量不确定度。 然而，通常情况下，具有“更好”特性的仪器比具有“更差”特性的仪器产生的不确定性更小。

ISO/CIE 19476:2014 is applicable to illuminance and luminance meters. It defines quality indices characterizing the performance of such devices in a general lighting measurement situation, as well as measurement procedures for the individual indices and standard calibration conditions. Measurements of illuminance or luminance and their accuracy are influenced by various parameters, such as operational conditions, properties of light sources, as well as characteristics of the applied photometers. The characteristics of these photometers alone do not allow the determination of the measurement uncertainty for a specific measurement task. Nevertheless, it is generally true that instruments with "better" characteristics in most cases produce smaller uncertainties than instruments with "worse" properties.